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Full Discussion: Unix space checking script
Homework and Emergencies Homework & Coursework Questions Unix space checking script Post 302494060 by Scott on Friday 4th of February 2011 04:52:41 PM
Old 02-04-2011
Getting there!

NR==2 isn't perfect. Some df's can output on three lines.

On Linux, using -P (the so-called "POSIX" option) would show the output on two lines.

i.e.
Code:
# ssh root@oraserv1
/ # cd /oracle
# df .
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/ora001vg-ora001lv
                       8252856   4752396   3081236  61% /oracle

/oracle # df -P .
Filesystem         1024-blocks      Used Available Capacity Mounted on
/dev/mapper/ora001vg-ora001lv   8252856   4752396   3081236      61% /oracle

tail is good. sed can also get the last line:
Code:
/oracle # df . | sed '$!d'  # from the link, search "print the last line of a file"
                       8252856   4752396   3081236  61% /oracle

And with awk, there's no need to remove the %. It'll do that for you when it know's it's a number.
Code:
$ echo 22% | awk '{print 100-$1}'  
78

 

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TAIL(1) 						      General Commands Manual							   TAIL(1)

NAME
tail - deliver the last part of a file SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ] tail [ -fr ] [ -n nlines ] [ -c ncharacters ] [ file ] DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied. Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or characters, according to the appended flag or Default is -10l (ten ell). The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears. The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed. EXAMPLES
tail file Print the last 10 lines of a file. tail +0f file Print a file, and continue to watch data accumulate as it grows. sed 10q file Print the first 10 lines of a file. SOURCE
/sys/src/cmd/tail.c BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length. According to custom, option +number counts lines from 1, and counts blocks and characters from 0. TAIL(1)
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